Momentum dependence of the superconducting gap and in-gap states in MgB2 multiband superconductor

Mou, Daixiang; Jiang, Rui; Taufour, Valentin; Bud'ko, S. L.; Canfield, P. C.; Kaminski, Adam

doi:10.1103/PhysRevB.91.214519

Title: Momentum dependence of the superconducting gap and in-gap states in ${MgB}_{2}$ multiband superconductor

Journal Article · Mon Jun 29 00:00:00 EDT 2015 · Physical Review. B, Condensed Matter and Materials Physics

DOI:https://doi.org/10.1103/PhysRevB.91.214519· OSTI ID:1227380

Mou, Daixiang ^[1]; Jiang, Rui ^[1]; Taufour, Valentin ^[1]; Bud'ko, S. L. ^[1]; Canfield, P. C. ^[1]; Kaminski, Adam ^[1]

Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

We use tunable laser-based angle-resolved photoemission spectroscopy to study the electronic structure of the multiband superconductor MgB₂. These results form the baseline for detailed studies of superconductivity in multiband systems. We find that the magnitude of the superconducting gap on both σ bands follows a BCS-like variation with temperature with Δ₀ ~ 7meV. Furthermore, the value of the gap is isotropic within experimental uncertainty and in agreement with a pure s-wave pairing symmetry. We observe in-gap states confined to k_F of the σ band that occur at some locations of the sample surface. As a result, the energy of this excitation, ~ 3 meV, was found to be somewhat larger than the previously reported gap on π Fermi sheet and therefore we cannot exclude the possibility of interband scattering as its origin.

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Research Organization:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-07CH11358

OSTI ID:: 1227380

Alternate ID(s):: OSTI ID: 1198619

Report Number(s):: IS-J-8675; PRBMDO

Journal Information:: Physical Review. B, Condensed Matter and Materials Physics, Vol. 91, Issue 21; ISSN 1098-0121

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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Self-Consistent Two-Gap Description of MgB2 Superconductor Kim, Hyunsoo; Cho, Kyuil; Tanatar, Makariy A. Symmetry, Vol. 11, Issue 8 https://doi.org/10.3390/sym11081012	journal	August 2019
Two-gap and three-gap superconductivity in ${AlB}_{2}$ -based films Zhao, Yinchang; Lian, Chao; Zeng, Shuming Physical Review B, Vol. 100, Issue 9 https://doi.org/10.1103/physrevb.100.094516	journal	September 2019
Observation of topological surface states in the high-temperature superconductor MgB2 Zhou, Xiaoqing; Gordon, Kyle N.; Jin, Kyung-Hwan American Physical Society https://doi.org/10.7892/boris.140697	text	January 2019

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